US20180038370A1 - Variable Volume Ratio Compressor - Google Patents
Variable Volume Ratio Compressor Download PDFInfo
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- US20180038370A1 US20180038370A1 US15/784,540 US201715784540A US2018038370A1 US 20180038370 A1 US20180038370 A1 US 20180038370A1 US 201715784540 A US201715784540 A US 201715784540A US 2018038370 A1 US2018038370 A1 US 2018038370A1
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- Prior art keywords
- discharge
- bypass
- passage
- valve
- compressor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/18—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the volume of the working chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
- F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
- F04C15/06—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
- F04C18/0223—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving with symmetrical double wraps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0246—Details concerning the involute wraps or their base, e.g. geometry
- F04C18/0253—Details concerning the base
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/10—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/10—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
- F04C28/16—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by changing the positions of the inlet or outlet openings with respect to the working chamber using lift valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
- F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
- F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
- F04C29/128—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type of the elastic type, e.g. reed valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
- F04C27/005—Axial sealings for working fluid
Definitions
- the present disclosure relates to a variable volume ratio compressor.
- a climate-control system such as, for example, a heat-pump system, a refrigeration system, or an air conditioning system, may include a fluid circuit having an outdoor heat exchanger, an indoor heat exchanger, an expansion device disposed between the indoor and outdoor heat exchangers, and one or more compressors circulating a working fluid (e.g., refrigerant or carbon dioxide) between the indoor and outdoor heat exchangers.
- a working fluid e.g., refrigerant or carbon dioxide
- the present disclosure provides a compressor that may include a shell, first and second scroll members, a partition plate, a bypass valve retainer and a bypass valve member.
- the shell may define a discharge-pressure region and a suction-pressure region.
- the first scroll member is disposed within the shell and includes a first end plate and a first spiral wrap extending from a first side of the first end plate.
- the first end plate may include a discharge passage, a first bypass passage and a second bypass passage extending through the first side and a second side of the first end plate.
- the second scroll member includes a second spiral wrap cooperating with the first spiral wrap to define first and second fluid pockets therebetween. The first and second fluid pockets may be in communication with the first and second bypass passages, respectively.
- the partition plate is disposed within the shell and separates the discharge-pressure region from the suction-pressure region.
- the partition plate may include a first opening in communication with the discharge-pressure region.
- the bypass valve retainer may be attached to the partition plate and may include a second opening in communication with the first opening, the discharge passage and the discharge-pressure region.
- the bypass valve member may be disposed around the discharge passage within the first opening and may be movable between a first position in which the bypass valve member contacts the first end plate and restricts fluid flow through at least one of the first and second bypass passages and a second position in which the bypass valve member allows fluid flow through the at least one of the first and second bypass passages and through the second opening.
- the compressor includes a spring member disposed between the bypass valve retainer and the bypass valve member and biasing the bypass valve member toward the first position.
- the spring member is integral with the bypass valve member.
- the compressor includes a discharge valve member movable relative to the bypass valve retainer between a first position in which the discharge valve member contacts the bypass valve retainer and restricts communication between the second opening and the discharge-pressure region and a second position in which the discharge valve member is spaced apart from the bypass valve retainer and allows communication between the second opening and the discharge-pressure region.
- the compressor includes a discharge valve retainer attached to the bypass valve retainer and defining a cavity in which the discharge valve member is movable between the first and second positions.
- the cavity may be in communication with the discharge-pressure region.
- the discharge valve retainer, the bypass valve retainer and the partition plate are separate components that are fixed relative to each other.
- the first end plate cooperates with the partition plate to define an annular biasing chamber therebetween that extends around the discharge passage and the first and second bypass passages.
- the first end plate may include a bleed hole extending therethrough and in communication with the biasing chamber.
- the compressor includes first and second seal members sealing contacting the first end plate and the partition plate and defining the biasing chamber.
- the first end plate includes first and second annular grooves.
- the first and second seal members may each include an L-shaped cross section having a first leg and a second leg.
- the first legs of the first and second seal members may be received in the first and second annular grooves, respectively.
- the second legs of the first and second seal members may extend parallel to the partition plate and sealingly contact the first end plate and the partition plate.
- the present disclosure provides a compressor that may include a shell, first and second scroll members, a partition plate and a bypass valve member.
- the shell may define a discharge-pressure region and a suction-pressure region.
- the first scroll member is disposed within the shell and includes a first end plate and a first spiral wrap extending from a first side of the first end plate.
- the first end plate may include a discharge passage, a first bypass passage and a second bypass passage extending through the first side and a second side of the first end plate.
- the second scroll member includes a second spiral wrap cooperating with the first spiral wrap to define first and second fluid pockets therebetween. The first and second fluid pockets may be in communication with the first and second bypass passages, respectively.
- the partition plate is disposed within the shell and separates the discharge-pressure region from the suction-pressure region.
- the partition plate may include an opening in communication with the discharge-pressure region.
- the first scroll member may include a hub through which the discharge passage may extend.
- the bypass valve member may be disposed around the hub and may be movable between a first position in which the bypass valve member restricts fluid flow through at least one of the first and second bypass passages and a second position in which the bypass valve member allows fluid flow through the at least one of the first and second bypass passages and into the discharge-pressure region.
- the compressor includes a bypass valve retainer and a spring member.
- the bypass valve retainer may be attached to an outer diametrical surface of the hub.
- the spring member may be disposed between the bypass valve retainer and the bypass valve member and may bias the bypass valve member toward the first position.
- the spring member is integral with the bypass valve member.
- the compressor includes a retaining ring partially received in an annular groove formed in the hub and extending radially outward from the hub.
- the spring member may bias the bypass valve retainer into contact with the retaining ring.
- the compressor includes a discharge valve member movable relative to the hub between a first position in which the discharge valve member contacts the hub and restricts communication between the discharge passage and the discharge-pressure region and a second position in which the discharge valve member is spaced apart from the hub and allows communication between the discharge passage and the discharge-pressure region.
- the hub extends at least partially through the opening in the partition plate and includes a diametrical surface cooperating with a diametrical surface of the opening to define an annular chamber therebetween.
- the annular chamber may receive fluid from the first and second bypass passages when the bypass valve member is in the second position.
- bypass valve retainer is disposed within the annular chamber.
- the compressor includes a discharge valve retainer attached to the partition plate and defining a discharge cavity in communication with the discharge-pressure region.
- a discharge valve member may be disposed within the discharge cavity and may be movable therein between a first position in which the discharge valve member restricts communication between the discharge passage and the discharge cavity and restricts communication between the annular chamber and the discharge cavity and a second position in which the discharge valve member allows communication between the discharge passage and the discharge cavity and allows communication between the annular chamber and the discharge cavity.
- the discharge valve retainer includes a diametrical surface defining the discharge cavity and including a plurality of openings providing communication between the discharge-pressure region and the discharge cavity.
- the first end plate cooperates with the partition plate to define an annular biasing chamber therebetween that extends around the discharge passage and the first and second bypass passages.
- the first end plate may include a bleed hole extending therethrough and communicating with the biasing chamber.
- the compressor includes first and second seal members sealing contacting the first end plate and the partition plate and defining the biasing chamber.
- the first end plate includes first and second annular grooves.
- the first and second seal members may each include an L-shaped cross section having a first leg and a second leg.
- the first legs of the first and second seal members may be received in the first and second annular grooves, respectively.
- the second legs of the first and second seal members may extend parallel to the partition plate and sealingly contact the first end plate and the partition plate.
- the present disclosure provides a compressor that may include a shell, first and second scroll members, a partition plate, a valve housing and a bypass valve member.
- the shell may define a discharge-pressure region and a suction-pressure region.
- the first scroll member is disposed within the shell and includes a first end plate and a first spiral wrap extending from a first side of the first end plate.
- the first end plate may include a discharge recess, a discharge passage, a first bypass passage and a second bypass passage.
- the discharge recess may be in communication with the discharge passage and the discharge-pressure region.
- the first and second bypass passages may extending through the first side and a second side of the first end plate.
- the second scroll member includes a second spiral wrap cooperating with the first spiral wrap to define first and second fluid pockets therebetween.
- the first and second fluid pockets may be in communication with the first and second bypass passages, respectively.
- the partition plate is disposed within the shell and separates the discharge-pressure region from the suction-pressure region.
- the valve housing may extend at least partially through the partition plate and may be partially received in the discharge recess.
- the valve housing may include a first passage extending therethrough and communicating with the discharge-pressure region and the discharge recess.
- the bypass valve member may be disposed between the first end plate and a flange of the valve housing and may be movable between a first position in which the bypass valve member restricts fluid flow through at least one of the first and second bypass passages and a second position in which the bypass valve member allows fluid flow through the at least one of the first and second bypass passages and into the first passage in the valve housing.
- the valve housing includes a second passage having a first portion with a first diameter and a second portion with a second diameter that is larger than the first diameter to form a first annular ledge.
- the compressor includes a discharge valve disposed within the discharge recess and including a stem portion that is slidably received in the second portion of the second passage of the valve housing.
- the discharge valve may be movable relative to the valve housing and the first end plate between a first position in which the discharge valve contacts a second annular ledge defining the discharge recess and restricts communication between the discharge passage and the first passage and a second position in which the discharge valve is spaced apart from the second annular ledge and allows communication between the discharge passage and the first passage.
- the first portion of the second passage in the valve housing allows high-pressure fluid in the discharge-pressure region to bias the discharge valve toward the first position.
- the compressor includes a floating seal slidably received in an annular recess formed in the first end plate.
- the floating seal may cooperate with the first end plate to define a biasing chamber therebetween.
- the first end plate may include a bleed hole extending therethrough and communicating with the biasing chamber.
- the floating seal contacts the valve housing and defines an annular chamber in which the bypass valve member is disposed.
- the first and second bypass passages are disposed between the discharge recess and the annular recess.
- the compressor includes a retaining ring engaging the valve housing and disposed within the discharge recess.
- the retaining ring may extend radially between the valve housing and a diametrical surface of the discharge recess.
- bypass valve member is an annular member that slidably engages the valve housing.
- the compressor includes a spring member disposed between the valve housing and the bypass valve member and biasing the bypass valve member toward the first position.
- the spring member is integral with the bypass valve member.
- the present disclosure provides a compressor that may include a shell, first and second scroll members, a partition plate and first and second bypass valve members.
- the shell may define a discharge-pressure region and a suction-pressure region.
- the first scroll member is disposed within the shell and includes a first end plate and a first spiral wrap extending from a first side of the first end plate.
- the first end plate may include a discharge passage, a first bypass passage and a second bypass passage extending through the first side and a second side of the first end plate.
- the second scroll member includes a second spiral wrap cooperating with the first spiral wrap to define first and second fluid pockets therebetween. The first and second fluid pockets may be in communication with the first and second bypass passages, respectively.
- the partition plate is disposed within the shell and separates the discharge-pressure region from the suction-pressure region.
- the partition plate may include first and second openings in communication with the first and second bypass passages.
- the first and second bypass valve members may be movable between first positions restricting fluid flow through the first and second openings and second positions allowing fluid flow through the first and second openings.
- the compressor includes a first annular seal fluidly coupling the first bypass passage and the first opening and a second annular seal fluidly coupling the second bypass passage and the second opening.
- the partition plate and the first end plate cooperate to define a biasing chamber therebetween, and wherein the first and second annular seals extend axially through the biasing chamber.
- the first and second bypass valve members are disposed within the discharge-pressure region and mounted to the partition plate.
- the first and second bypass valve members are reed valves that flex between the open and closed positions.
- the compressor includes first and second rigid valve retainers that clamp the first and second bypass valve members against the partition plate and define a range of flexing movement of the first and second bypass valve members.
- the compressor includes third and fourth annular seals that contact the partition plate and the end plate and cooperate to define the biasing chamber therebetween.
- the first end plate includes first and second annular grooves.
- the third and fourth annular seals may each include an L-shaped cross section having a first leg and a second leg.
- the first legs of the third and fourth annular seals may be received in the first and second annular grooves, respectively.
- the second legs of the third and fourth annular seals may extend parallel to the partition plate and sealingly contacting the first end plate and the partition plate.
- the first end plate includes a hub that extends axially through a third opening in the partition plate between the first and second openings.
- the discharge passage extends through the hub.
- the compressor includes a discharge valve disposed within the discharge-pressure region and movable between a first position restricting communication between the discharge passage and the discharge-pressure region and a second position allowing communication between the discharge passage and the discharge-pressure region.
- the discharge valve contacts the hub in the first position.
- the compressor includes a discharge valve retainer attached to the partition plate and defining a discharge cavity in communication with the discharge-pressure region.
- the discharge valve may be disposed within the discharge cavity and may be movable therein between the first and second positions.
- the discharge valve retainer may include a diametrical surface defining the discharge cavity and including a plurality of openings providing communication between the discharge-pressure region and the discharge cavity.
- FIG. 1 is a cross-sectional view of a compressor having a variable volume ratio valve system according to the principles of the present disclosure
- FIG. 2 is a partial cross-sectional view of the compressor of FIG. 1 with a bypass valve in a closed position;
- FIG. 3 is a partial cross-sectional view of the compressor of FIG. 1 with a bypass valve in an open position;
- FIG. 4 is a partial cross-sectional view of another compressor of with a bypass valve in a closed position
- FIG. 5 is a partial cross-sectional view of the compressor of FIG. 4 with a bypass valve in an open position;
- FIG. 6 is a partial cross-sectional view of another compressor of with a bypass valve in a closed position
- FIG. 7 is a partial cross-sectional view of the compressor of FIG. 6 with a bypass valve in an open position
- FIG. 8 is a partial cross-sectional view of another compressor of with a bypass valve in an open position
- FIG. 9 is a partial cross-sectional view of the compressor of FIG. 8 with a bypass valve in a closed position
- FIG. 10 is a perspective view of a valve and spring assembly according to the principles of the present disclosure.
- FIG. 11 is a perspective view of another valve and spring assembly according to the principles of the present disclosure.
- FIG. 12 is a perspective view of yet another valve and spring assembly according to the principles of the present disclosure.
- Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
- first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
- Spatially relative terms such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
- a compressor 10 may include a shell assembly 12 , a discharge fitting 14 , a suction inlet fitting 16 , a motor assembly 18 , a bearing housing assembly 20 , a compression mechanism 22 , and a variable volume ratio assembly 24 .
- the shell assembly 12 may house the motor assembly 18 , the bearing housing assembly 20 , the compression mechanism 22 , and the variable volume ratio assembly 24 .
- the shell assembly 12 may include a generally cylindrical shell 34 , an end cap 36 , a transversely extending partition plate 37 , and a base 38 .
- the end cap 36 may be fixed to an upper end of the shell 34 .
- the base 38 may be fixed to a lower end of shell 34 .
- the end cap 36 and partition plate 37 may define a discharge chamber 42 (i.e., a discharge-pressure region) therebetween that receives compressed working fluid from the compression mechanism 22 .
- the partition plate 37 may include an opening 39 providing communication between the compression mechanism 22 and the discharge chamber 42 .
- the discharge chamber 42 may generally form a discharge muffler for the compressor 10 .
- the discharge fitting 14 may be attached to the end cap 36 and is in fluid communication with the discharge chamber 42 .
- the suction inlet fitting 16 may be attached to the shell 34 and may be in fluid communication with a suction chamber 43 (i.e., a suction-pressure region).
- the partition plate 37 separates the discharge chamber 42 from the suction chamber 43 .
- the motor assembly 18 may include a motor stator 44 , a rotor 46 , and a driveshaft 48 .
- the stator 44 may be press fit into the shell 34 .
- the driveshaft 48 may be rotatably driven by the rotor 46 and supported by the bearing housing assembly 20 .
- the driveshaft 48 may include an eccentric crank pin 52 having a flat thereon for driving engagement with the compression mechanism 22 .
- the rotor 46 may be press fit on the driveshaft 48 .
- the bearing housing assembly 20 may include a main bearing housing 54 and a lower bearing housing 56 fixed within the shell 34 .
- the main bearing housing 54 may include an annular flat thrust bearing surface 58 that supports the compression mechanism 22 thereon.
- the compression mechanism 22 may be driven by the motor assembly 18 and may generally include an orbiting scroll 60 and a non-orbiting scroll 62 .
- the orbiting scroll 60 may include an end plate 64 having a spiral vane or wrap 66 on the upper surface thereof and an annular flat thrust surface 68 on the lower surface.
- the thrust surface 68 may interface with an annular flat thrust bearing surface 58 on the main bearing housing 54 .
- a cylindrical hub 70 may project downwardly from the thrust surface 68 and may have a drive bushing 72 disposed therein.
- the drive bushing 72 may include an inner bore in which the crank pin 52 is drivingly disposed.
- the crank pin 52 may drivingly engage a flat surface in a portion of the inner bore of the drive bushing 72 to provide a radially compliant driving arrangement.
- the non-orbiting scroll 62 may include an end plate 78 and a spiral wrap 80 extending from a first side 82 of the end plate 78 .
- the spiral wraps 66 , 80 cooperate to form a plurality of fluid pockets 83 therebetween.
- a second side 84 of the end plate 78 may include a hub 86 and inner and outer annular grooves 88 , 90 ( FIGS. 2 and 3 ).
- the hub 86 can be generally axially aligned with the rotational axis of the driveshaft 48 .
- the annular grooves 88 , 90 may be substantially concentric with each other and the hub 86 and may surround the hub 86 .
- Inner and outer annular seals 91 , 92 may be partially received in the annular grooves 88 , 90 , respectively, and may sealingly contact the partition plate 37 and the end plate 78 to form an annular biasing chamber 97 therebetween.
- the annular seals 91 , 92 may have generally L-shaped cross sections having first and second legs 93 , 94 ( FIGS. 2 and 3 ).
- the first legs 93 may be received in the corresponding annular grooves 88 , 90
- the second legs 94 may extend generally parallel to the partition plate 37 and the end plate 78 and sealingly contact the partition plate 37 and the end plate 78 .
- the non-orbiting scroll 62 may also include a discharge passage 95 , first and second bypass passages 96 , 98 and a bleed hole 100 that extend through the end plate 78 .
- the discharge passage 95 may extend axially through the hub 86 and may be in fluid communication with a central fluid pocket 83 defined by the spiral wraps 66 , 80 .
- the first and second bypass passages 96 , 98 are variable volume ratio passages disposed radially outward relative to the discharge passage 95 and are in fluid communication with respective ones of the fluid pockets 83 .
- the first and second bypass passages 96 , 98 may extend through the hub 86 and may be disposed radially between the discharge passage 95 and the inner annular groove 88 .
- the bleed hole 100 may be disposed radially between the inner and outer annular grooves 88 , 90 and may be in communication with an intermediate-pressure (higher than suction pressure and less than discharge pressure) fluid pocket 83 .
- the bleed hole 100 is in fluid communication with the annular biasing chamber 97 and provides intermediate-pressure working fluid to the annular biasing chamber 97 . In this manner, the working fluid in the annular biasing chamber 97 biases the non-orbiting scroll 62 in an axial direction (i.e., in a direction parallel to the axis of rotation of the driveshaft 48 ) into engagement with the orbiting scroll 60 .
- variable volume ratio assembly 24 may include a bypass valve retainer 102 , a bypass valve member 104 , a spring member 106 , a discharge valve retainer 108 and a discharge valve member 110 .
- the bypass valve retainer 102 may be fixedly attached to the partition plate 37 and may be an annular member having a first side 112 with a first annular ridge 114 extending therefrom and a second side 116 opposite the first side 112 with a second ridge 118 extending therefrom.
- the first annular ridge 114 may extend into the opening 39 of the partition plate 37 and an outer diametrical surface 120 of the first annular ridge 114 may engage an inner diametrical surface 122 of the opening 39 by a press-fit, for example.
- the second annular ridge 118 can be concentric with the first annular ridge 114 and may define an opening 124 in fluid communication with the discharge passage 95 , the opening 39 and the discharge chamber 42 .
- the bypass valve member 104 can be a generally flat, annular member and may be disposed within the opening 39 of the partition plate 37 between the hub 86 of the non-orbiting scroll 62 and bypass valve retainer 102 .
- the bypass valve member 104 may surround the discharge passage 95 and may be movable between a closed position ( FIG. 2 ) and an open position ( FIG. 3 ). In the closed position, the bypass valve member 104 is in contact with the hub 86 and restricts or prevents fluid flow through the first and second bypass passages 96 , 98 (i.e., restricting or preventing fluid communication between the bypass passages 96 , 98 and the discharge chamber 42 ).
- bypass valve member 104 In the open position, the bypass valve member 104 is spaced apart from the hub 86 and allows fluid flow through the first and second bypass passages 96 , 98 (i.e., allowing fluid communication between the bypass passages 96 , 98 and the discharge chamber 42 ).
- the spring member 106 may be disposed between and in contact with the bypass valve member 104 and the bypass valve retainer 102 such that the spring member 106 biases the bypass valve member 104 toward the closed position.
- the partition plate 37 may include an annular ledge 125 that extends radially into the opening 39 of the partition plate 37 .
- the bypass valve member 104 may be disposed axially between the annular ledge 125 and the bypass valve retainer 102 . In this manner, the annular ledge 125 and the bypass valve retainer 102 cooperate to keep the bypass valve member 104 captive within the opening 39 . Therefore, the partition plate 37 and the variable volume ratio assembly 24 can be assembled as a unit separately from the non-orbiting scroll 62 .
- the discharge valve retainer 108 may be fixedly attached to the bypass valve retainer 102 and may include a central hub 126 and a flange 128 extending radially outward from the central hub 126 .
- the central hub 126 may define a cavity 130 in fluid communication with the discharge chamber 42 via a plurality of apertures 132 that extend through inner and outer diametrical surfaces of the central hub 126 .
- the second annular ridge 118 of the bypass valve retainer 102 may be received in the cavity 130 and may act as a valve stop for the discharge valve member 110 .
- a tube 134 may extend through an axial end 136 of the central hub 126 and may direct a portion of the fluid in the cavity 130 directly to the discharge fitting 14 .
- the discharge valve member 110 may be a generally flat disk and may be movably received in the cavity 130 of the discharge valve retainer 108 .
- the discharge valve member 110 may be movable relative to the discharge valve retainer 108 and the bypass valve retainer 102 between a closed position in which the discharge valve member 110 is seated against the second annular ridge 118 and an open position in which the discharge valve member 110 is spaced apart from the second annular ridge 118 .
- the discharge valve member 110 restricts or prevents fluid communication between the discharge chamber 42 and the opening 124 of the bypass valve retainer 102 (thereby restricting or preventing fluid communication between the discharge passage 95 and the discharge chamber 42 ).
- the discharge valve member 110 allows fluid communication between the discharge chamber 42 and the opening 124 of the bypass valve retainer 102 (thereby allowing fluid communication between the discharge passage 95 and the discharge chamber 42 ).
- working fluid in the pockets 83 between the wraps 66 , 80 of the orbiting and non-orbiting scrolls 60 , 62 increase in pressure as the pockets 83 move from a radially outer position (e.g., at suction pressure) toward a radially inner position (e.g., at discharge pressure).
- the bypass valve member 104 and spring member 106 may be configured so that the bypass valve member 104 will move into the open position when exposed to pockets 83 having working fluid at or above a predetermined pressure.
- the predetermined pressure can be selected to prevent the compressor 10 from over-compressing working fluid when the compressor 10 is operating under lighter load conditions, for example, such as during operation in a cooling mode of a reversible heat-pump system.
- a system pressure ratio of a heat-pump system in the cooling mode may be lower than the system pressure ratio of the heat-pump system in a heating mode.
- the bypass valve member 104 will move into the open position to allow the working fluid to flow through the bypass passages 96 , 98 , through the openings 39 , 124 and into the discharge chamber 42 and/or the tube 134 (after forcing the discharge valve member 110 toward the open position).
- the first and second bypass passages 96 , 98 may act as discharge passages when the bypass valve member 104 is in the open position.
- non-orbiting scroll 62 could include one or more other bypass passages in addition to the first and second bypass passages 96 , 98 . In other configurations, the non-orbiting scroll 62 could include only one of the bypass passages 96 , 98 .
- the compressor 210 may have similar or identical structure and functions as the compressor 10 described above, apart from exceptions described below.
- the compressor 210 may include a partition plate 237 , an orbiting scroll 260 , a non-orbiting scroll 262 and a variable volume ratio assembly 224 .
- the partition plate 237 may separate a discharge chamber 242 and a suction chamber (like the suction chamber 43 ).
- the partition plate 237 includes an opening 239 in fluid communication with the discharge chamber 242 .
- the non-orbiting scroll 262 includes an end plate 278 and a spiral wrap 280 extending from a first side 282 of the end plate 278 .
- a second side 284 of the end plate 278 may include a hub 286 and inner and outer annular grooves 288 , 290 .
- the hub 286 may extend axially through the opening 239 in the partition plate 237 .
- the hub 286 may include an outer diametrical surface 287 that cooperates with a diametrical surface 289 of the opening 239 to define an annular chamber 285 therebetween.
- the annular grooves 288 , 290 may be substantially concentric with each other and the hub 286 and may surround the hub 286 .
- Inner and outer annular seals 291 , 292 may be partially received in the annular grooves 288 , 290 , respectively, and may sealingly contact the partition plate 237 and the end plate 278 to form an annular biasing chamber 297 therebetween, as described above.
- the non-orbiting scroll 262 may also include a discharge passage 295 , first and second bypass passages 296 , 298 and a bleed hole 300 that extend through the end plate 278 .
- the discharge passage 295 may extend axially through the hub 286 and may be in fluid communication with a central fluid pocket 283 defined by spiral wraps 266 , 280 of the orbiting and non-orbiting scrolls 260 , 262 .
- the first and second bypass passages 296 , 298 are variable volume ratio passages disposed radially outward relative to the discharge passage 295 and the hub 286 and are in fluid communication with respective ones of the fluid pockets 283 .
- the first and second bypass passages 296 , 298 may be disposed radially between the hub 286 and the inner annular groove 288 .
- the bleed hole 300 may be disposed radially between the inner and outer annular grooves 288 , 290 and may be in communication with an intermediate-pressure (higher than suction pressure and less than discharge pressure) fluid pocket 283 .
- the bleed hole 300 is in fluid communication with the annular biasing chamber 297 and provides intermediate-pressure working fluid to the annular biasing chamber 297 . In this manner, the working fluid in the annular biasing chamber 297 biases the non-orbiting scroll 262 in an axial direction into engagement with the orbiting scroll 260 .
- the variable volume ratio assembly 224 may include a bypass valve retainer 302 , a retaining ring 303 , a bypass valve member 304 , a spring member 306 , a discharge valve retainer 308 and a discharge valve member 310 .
- the bypass valve retainer 302 can be an annular member that receives the hub 286 (i.e., the bypass valve retainer 302 extends around the hub 286 ).
- the bypass valve retainer 302 may be press-fit onto the outer diametrical surface 287 .
- the bypass valve retainer 302 may include a generally L-shaped cross section.
- the retaining ring 303 may be partially received in an annular groove 311 formed in the outer diametrical surface 287 of the hub 286 .
- the spring member 306 may bias the bypass valve retainer 302 into contact with the retaining ring 303 .
- the bypass valve member 304 can be a generally flat, annular member and may extend around the hub 286 and may be disposed axially between a portion of the end plate 278 and the bypass valve retainer 302 .
- the bypass valve member 304 may surround the discharge passage 95 and may be movable between a closed position ( FIG. 4 ) and an open position ( FIG. 5 ). In the closed position, the bypass valve member 304 is in contact with the end plate 278 and restricts or prevents fluid flow through the first and second bypass passages 296 , 298 (i.e., restricting or preventing fluid communication between the bypass passages 296 , 298 and the discharge chamber 242 ).
- bypass valve member 304 In the open position, the bypass valve member 304 is spaced apart from the end plate 278 and allows fluid flow through the first and second bypass passages 296 , 298 (i.e., allowing fluid communication between the bypass passages 296 , 298 and the discharge chamber 242 ).
- the spring member 306 may be disposed between and in contact with the bypass valve member 304 and the bypass valve retainer 302 such that the spring member 306 biases the bypass valve member 304 toward the closed position.
- the discharge valve retainer 308 and the discharge valve member 310 can have similar or identical structure and function as the discharge valve retainer 108 and the discharge valve member 110 .
- the discharge valve retainer 308 can be mounted directly to the partition plate 237 .
- the discharge valve retainer 308 may include a central hub 326 defining a cavity 330 .
- the hub 286 of the non-orbiting scroll 262 may extend into the cavity 330 and an axial end of the hub 286 may define a valve seat 331 for the discharge valve member 310 . That is, the discharge valve member 310 contacts the valve seat 331 when the discharge valve member 310 is in the closed position to restrict or prevent fluid communication between the discharge passage 295 and the discharge chamber 242 . In the closed position, the discharge valve member 310 may also restrict or prevent fluid communication between the annular chamber 285 and the discharge chamber 242 .
- Operation of the variable volume ratio assembly 224 may be similar or identical to that of the variable volume ratio assembly 24 described above. That is, the bypass valve member 304 may open to prevent an over-compression condition.
- the bypass valve member 304 When working fluid is being compressed by the scrolls 260 , 262 to a pressure equal to or greater than the predetermined pressure by the time the pockets 283 containing the working fluid reaches the first and/or second bypass passages 296 , 298 , the bypass valve member 304 will move into the open position to discharge the working fluid to the discharge chamber 242 , as described above.
- non-orbiting scroll 262 could include one or more other bypass passages in addition to the first and second bypass passages 296 , 298 . In other configurations, the non-orbiting scroll 262 could include only one of the bypass passages 296 , 298 .
- another compressor 410 may have similar or identical structure and functions as the compressors 10 , 210 described above, apart from exceptions described below.
- the compressor 410 may include a partition plate 437 , an orbiting scroll 460 , a non-orbiting scroll 462 and a variable volume ratio assembly 424 .
- the partition plate 437 may separate a discharge chamber 442 and a suction chamber 443 .
- the partition plate 437 includes an opening 439 through which fluid is provided to the discharge chamber 442 .
- the non-orbiting scroll 462 may include an end plate 478 and a spiral wrap 480 extending therefrom.
- the end plate 478 may include a hub 486 and an annular recess 488 .
- the annular recess 488 may at least partially receive a floating seal assembly 490 therein.
- the recess 488 and the seal assembly 490 may cooperate to define an axial biasing chamber 492 therebetween.
- the non-orbiting scroll 462 may also include a discharge recess 493 , a discharge passage 495 , first and second bypass passages 496 , 498 and a bleed hole 500 that extend through the end plate 478 .
- the discharge recess 493 may extend axially through the hub 486 and may be in fluid communication with a central fluid pocket 483 (defined by the scrolls 460 , 462 ) via the discharge passage 495 .
- the first and second bypass passages 496 , 498 are variable volume ratio passages disposed radially outward relative to the discharge passage 495 and are in fluid communication with respective ones of the fluid pockets 483 .
- the first and second bypass passages 496 , 498 may extend through the hub 486 and may be disposed radially between the discharge passage 495 and the annular recess 488 .
- the bleed hole 500 may be in communication with an intermediate-pressure (higher than suction pressure and less than discharge pressure) fluid pocket 483 and the annular biasing chamber 492 and provides intermediate-pressure working fluid to the annular biasing chamber 492 . In this manner, the working fluid in the annular biasing chamber 492 biases the non-orbiting scroll 462 in an axial direction into engagement with the orbiting scroll 460 .
- the variable volume ratio assembly 424 may include a valve housing 502 , a retaining ring 503 , a bypass valve member 504 , a spring member 506 , and a discharge valve member 510 .
- the valve housing 502 may act as a valve guide and valve stop for the bypass valve member 504 and the discharge valve member 510 .
- the valve housing 502 may be partially received in the opening 439 in the partition plate 437 and may extend into the discharge recess 493 . In some embodiments, the valve housing 502 can be press-fit into the opening 439 .
- a radially outwardly extending flange 511 of the valve housing 502 can be disposed within the suction chamber 443 and may contact the floating seal assembly 490 .
- the valve housing 502 may include a first passage 512 extending therethrough and in fluid communication with the discharge recess 493 and the discharge chamber 442 .
- the valve housing 502 may include a second passage 514 in fluid communication with the discharge chamber 442 and disposed radially inward relative to the first passage 512 .
- the second passage 514 may include a first portion 515 and a second portion 517 .
- the second portion 517 may include a larger diameter than a diameter of the first portion 515 such that the second portion 517 defines an annular ledge 519 .
- the retaining ring 503 may be disposed within the discharge recess 493 and may engage the valve housing 502 .
- the retaining ring 503 may retain the bypass valve member 54 and the spring member 506 relative to the valve housing 502 , particularly during assembly of the compressor 410 .
- the bypass valve member 504 may be a generally flat, annular member surrounding a portion of the valve housing 502 between the flange 511 and an axial end of the hub 486 .
- the bypass valve member 504 may be movable between a closed position ( FIG. 6 ) and an open position ( FIG. 7 ). In the closed position, the bypass valve member 504 is in contact with the end plate hub 486 and restricts or prevents fluid flow through the first and second bypass passages 496 , 498 (i.e., restricting or preventing fluid communication between the bypass passages 496 , 498 and the discharge chamber 442 ).
- bypass valve member 504 In the open position, the bypass valve member 504 is spaced apart from the hub 486 and allows fluid flow through the first and second bypass passages 496 , 498 (i.e., allowing fluid communication between the bypass passages 496 , 498 and the discharge chamber 442 via the first passage 512 of the valve housing 502 ).
- the spring member 506 may be disposed between and in contact with the bypass valve member 504 and the flange 511 of the valve housing 502 such that the spring member 506 biases the bypass valve member 504 toward the closed position.
- the discharge valve member 510 may be disposed within the discharge recess 493 and may include a stem portion 518 and a flange portion 520 .
- the stem portion 518 may be slidably received in the second portion 517 of the second passage 514 of the valve housing 502 .
- the discharge valve member 510 is movable between a closed position ( FIG. 6 ) and an open position ( FIG. 7 ).
- the flange portion 520 of the discharge valve member 510 When the discharge valve member 510 is in the closed position, the flange portion 520 of the discharge valve member 510 is in contact with an annular ledge 522 defining a lower axial end of the discharge recess 493 to restrict or prevent fluid communication between the discharge recess 493 and the discharge passage 495 (thereby restricting or preventing fluid communication between the discharge passage 495 and the first passage 512 in the valve housing 502 ).
- the flange portion 520 is spaced apart from the annular ledge 522 so that the discharge passage 495 is allowed to fluidly communicate with the discharge recess 493 and the first passage 512 of the valve housing 502 .
- the annular ledge 519 in the first passage 512 of the valve housing 502 may contact the stem portion 518 of the discharge valve member 510 in the fully open position (as shown in FIG. 7 ).
- the first portion 515 of the second passage 514 of the valve housing 502 allows high-pressure fluid in the discharge chamber 442 to bias the discharge valve member 510 toward the closed position.
- variable volume ratio assembly 424 Operation of the variable volume ratio assembly 424 may be similar or identical to that of the variable volume ratio assembly 24 , 224 described above. That is, the bypass valve member 504 may open to prevent an over-compression condition.
- the bypass valve member 504 When working fluid is being compressed by the scrolls 460 , 462 to a pressure equal to or greater than the predetermined pressure by the time the pockets 483 containing the working fluid reaches the first and/or second bypass passages 496 , 498 , the bypass valve member 504 will move into the open position to discharge the working fluid to the discharge chamber 442 , as described above.
- non-orbiting scroll 462 could include one or more other bypass passages in addition to the first and second bypass passages 496 , 498 . In other configurations, the non-orbiting scroll 462 could include only one of the bypass passages 496 , 498 .
- the compressor 610 may have similar or identical structure and functions as the compressors 10 , 210 , 410 described above, apart from exceptions described below.
- the compressor 610 may include a partition plate 637 , an orbiting scroll 660 , a non-orbiting scroll 662 and a variable volume ratio assembly 624 .
- the partition plate 637 may separate a discharge chamber 642 and a suction chamber 643 .
- the partition plate 637 includes a central opening 639 through which fluid is provided to the discharge chamber 642 .
- the partition plate 637 may also include first and second bypass openings 645 , 647 that extend through the partition plate 637 and fluidly communicate with the discharge chamber 642 .
- the non-orbiting scroll 662 includes an end plate 678 having a hub 686 and inner and outer annular grooves 688 , 690 .
- the hub 686 may extend axially through the opening 639 in the partition plate 637 .
- the annular grooves 688 , 690 may be substantially concentric with each other and the hub 686 and may surround the hub 686 .
- Inner and outer annular seals 691 , 692 (similar or identical to the seals 91 , 92 , 291 , 292 ) may be partially received in the annular grooves 688 , 690 , respectively, and may sealingly contact the partition plate 637 and the end plate 678 to form an annular biasing chamber 697 therebetween, as described above.
- the non-orbiting scroll 662 may also include a discharge passage 695 , first and second bypass passages 696 , 698 and a bleed hole (not shown; similar to the bleed hole 100 , 300 described above) that extend through the end plate 678 .
- the discharge passage 695 may extend axially through the hub 686 and may be in fluid communication with a central fluid pocket 683 defined by the scrolls 660 , 662 .
- the bleed hole may also be disposed radially between the inner and outer annular grooves 688 , 690 and may be in communication with an intermediate-pressure (higher than suction pressure and less than discharge pressure) fluid pocket 683 and the annular biasing chamber 697 to provide intermediate-pressure working fluid to the annular biasing chamber 697 .
- the bleed hole may be disposed radially outward relative to the first and second bypass passages 696 , 698 .
- the first and second bypass passages 696 , 698 are variable volume ratio passages disposed radially outward relative to the discharge passage 695 and the hub 686 and are in fluid communication with respective ones of the fluid pockets 683 .
- the first and second bypass passages 696 , 698 may be disposed radially between the inner annular groove 688 and the outer annular groove 690 , but are fluidly isolated from the annular biasing chamber 697 .
- the first and second bypass passages 696 , 698 may be axially aligned with the first and second bypass openings 645 , 647 , respectively, of the partition plate 637 .
- a first annular seal 649 is partially received in a recess 651 of the first bypass passage 696 and sealingly engages the end plate 678 and the partition plate 637 to fluidly isolate the first bypass passage 696 and the first bypass opening 645 from the annular biasing chamber 697 .
- a second annular seal 653 is partially received in a recess 655 of the second bypass passage 698 and sealingly engages the end plate 678 and the partition plate 637 to fluidly isolate the second bypass passage 698 and the second bypass opening 647 from the annular biasing chamber 697 .
- the variable volume ratio assembly 624 may include first and second bypass valve retainers 702 , 703 , first and second bypass valve members 704 , 705 , a discharge valve retainer 708 and a discharge valve member 710 .
- the bypass valve retainers 702 , 703 and the bypass valve members 704 , 705 can be mounted to the partition plate 637 within the discharge chamber 642 such that the bypass valve members 704 , 705 are clamped between the respective bypass valve retainers 702 , 703 and the partition plate 637 .
- the bypass valve members 704 , 705 may be reed valves that are flexible between open positions ( FIG. 8 ) in which the bypass valve members 704 , 705 allow fluid communication between the first and second bypass passages 696 , 698 and the discharge chamber 642 and closed positions ( FIG. 9 ) in which the bypass valve members 704 , 705 restrict or prevent fluid communication between the first and second bypass passages 696 , 698 and the discharge chamber 642 .
- the bypass valve retainers 702 , 703 may be rigid members that define a range of flexing movement of the bypass valve members 704 , 705 .
- the discharge valve retainer 708 and the discharge valve member 710 can have similar or identical structure and function as the discharge valve retainer 108 , 308 and the discharge valve member 110 , 310 .
- the discharge valve retainer 708 can be mounted directly to the partition plate 637 .
- the discharge valve retainer 708 may include a central hub 726 defining a cavity 730 .
- the hub 686 of the non-orbiting scroll 662 may extend into the cavity 730 and an axial end of the hub 686 may define a valve seat 731 for the discharge valve member 710 . That is, the discharge valve member 710 contacts the valve seat 731 when the discharge valve member 710 is in the closed position to restrict or prevent fluid communication between the discharge passage 695 and the discharge chamber 642 .
- variable volume ratio assembly 624 Operation of the variable volume ratio assembly 624 may be similar or identical to that of the variable volume ratio assembly 24 , 224 , 424 described above. That is, the bypass valve members 704 , 705 may open to prevent an over-compression condition.
- the bypass valve members 704 , 705 When working fluid is being compressed by the scrolls 660 , 662 to a pressure equal to or greater than the predetermined pressure by the time the pockets 683 containing the working fluid reaches the first and/or second bypass passages 696 , 698 , the bypass valve members 704 , 705 will move into the open position to discharge the working fluid to the discharge chamber 642 , as described above.
- non-orbiting scroll 662 could include one or more other bypass passages in addition to the first and second bypass passages 696 , 698 . In other configurations, the non-orbiting scroll 662 could include only one of the bypass passages 696 , 698 .
- bypass valve member 104 , 304 , 504 may be flat, annular members.
- the spring member 106 , 306 , 506 can be fixedly attached to the bypass valve member 104 , 304 , 504 or integrally formed therewith.
- the spring member 106 , 306 , 506 can be welded, cinched or otherwise fixed to the bypass valve member 104 , 304 , 504 . As shown in FIG.
- the spring member 106 , 306 , 506 can be a single, continuous wave ring that is resiliently compressible. As shown in FIG. 11 , the spring member 106 , 306 , 506 can include a plurality of resiliently flexible arcuate fingers. As shown in FIG. 12 , the spring member 106 , 306 , 506 can include a plurality of resiliently compressible helical coil springs. It will be appreciated that the spring member 106 , 306 , 506 could be otherwise shaped and/or configured.
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Abstract
Description
- This application is a divisional of U.S. patent application Ser. No. 14/663,073 filed on Mar. 19, 2015. The entire disclosure of the above application is incorporated herein by reference.
- The present disclosure relates to a variable volume ratio compressor.
- This section provides background information related to the present disclosure and is not necessarily prior art.
- A climate-control system such as, for example, a heat-pump system, a refrigeration system, or an air conditioning system, may include a fluid circuit having an outdoor heat exchanger, an indoor heat exchanger, an expansion device disposed between the indoor and outdoor heat exchangers, and one or more compressors circulating a working fluid (e.g., refrigerant or carbon dioxide) between the indoor and outdoor heat exchangers. Efficient and reliable operation of the one or more compressors is desirable to ensure that the climate-control system in which the one or more compressors are installed is capable of effectively and efficiently providing a cooling and/or heating effect on demand.
- This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.
- In one form, the present disclosure provides a compressor that may include a shell, first and second scroll members, a partition plate, a bypass valve retainer and a bypass valve member. The shell may define a discharge-pressure region and a suction-pressure region. The first scroll member is disposed within the shell and includes a first end plate and a first spiral wrap extending from a first side of the first end plate. The first end plate may include a discharge passage, a first bypass passage and a second bypass passage extending through the first side and a second side of the first end plate. The second scroll member includes a second spiral wrap cooperating with the first spiral wrap to define first and second fluid pockets therebetween. The first and second fluid pockets may be in communication with the first and second bypass passages, respectively. The partition plate is disposed within the shell and separates the discharge-pressure region from the suction-pressure region. The partition plate may include a first opening in communication with the discharge-pressure region. The bypass valve retainer may be attached to the partition plate and may include a second opening in communication with the first opening, the discharge passage and the discharge-pressure region. The bypass valve member may be disposed around the discharge passage within the first opening and may be movable between a first position in which the bypass valve member contacts the first end plate and restricts fluid flow through at least one of the first and second bypass passages and a second position in which the bypass valve member allows fluid flow through the at least one of the first and second bypass passages and through the second opening.
- In some configurations, the compressor includes a spring member disposed between the bypass valve retainer and the bypass valve member and biasing the bypass valve member toward the first position.
- In some configurations, the spring member is integral with the bypass valve member.
- In some configurations, the compressor includes a discharge valve member movable relative to the bypass valve retainer between a first position in which the discharge valve member contacts the bypass valve retainer and restricts communication between the second opening and the discharge-pressure region and a second position in which the discharge valve member is spaced apart from the bypass valve retainer and allows communication between the second opening and the discharge-pressure region.
- In some configurations, the compressor includes a discharge valve retainer attached to the bypass valve retainer and defining a cavity in which the discharge valve member is movable between the first and second positions. The cavity may be in communication with the discharge-pressure region.
- In some configurations, the discharge valve retainer, the bypass valve retainer and the partition plate are separate components that are fixed relative to each other.
- In some configurations, the first end plate cooperates with the partition plate to define an annular biasing chamber therebetween that extends around the discharge passage and the first and second bypass passages. The first end plate may include a bleed hole extending therethrough and in communication with the biasing chamber.
- In some configurations, the compressor includes first and second seal members sealing contacting the first end plate and the partition plate and defining the biasing chamber.
- In some configurations, the first end plate includes first and second annular grooves. The first and second seal members may each include an L-shaped cross section having a first leg and a second leg. The first legs of the first and second seal members may be received in the first and second annular grooves, respectively. The second legs of the first and second seal members may extend parallel to the partition plate and sealingly contact the first end plate and the partition plate.
- In another form, the present disclosure provides a compressor that may include a shell, first and second scroll members, a partition plate and a bypass valve member. The shell may define a discharge-pressure region and a suction-pressure region. The first scroll member is disposed within the shell and includes a first end plate and a first spiral wrap extending from a first side of the first end plate. The first end plate may include a discharge passage, a first bypass passage and a second bypass passage extending through the first side and a second side of the first end plate. The second scroll member includes a second spiral wrap cooperating with the first spiral wrap to define first and second fluid pockets therebetween. The first and second fluid pockets may be in communication with the first and second bypass passages, respectively. The partition plate is disposed within the shell and separates the discharge-pressure region from the suction-pressure region. The partition plate may include an opening in communication with the discharge-pressure region. The first scroll member may include a hub through which the discharge passage may extend. The bypass valve member may be disposed around the hub and may be movable between a first position in which the bypass valve member restricts fluid flow through at least one of the first and second bypass passages and a second position in which the bypass valve member allows fluid flow through the at least one of the first and second bypass passages and into the discharge-pressure region.
- In some configurations, the compressor includes a bypass valve retainer and a spring member. The bypass valve retainer may be attached to an outer diametrical surface of the hub. The spring member may be disposed between the bypass valve retainer and the bypass valve member and may bias the bypass valve member toward the first position.
- In some configurations, the spring member is integral with the bypass valve member.
- In some configurations, the compressor includes a retaining ring partially received in an annular groove formed in the hub and extending radially outward from the hub. The spring member may bias the bypass valve retainer into contact with the retaining ring.
- In some configurations, the compressor includes a discharge valve member movable relative to the hub between a first position in which the discharge valve member contacts the hub and restricts communication between the discharge passage and the discharge-pressure region and a second position in which the discharge valve member is spaced apart from the hub and allows communication between the discharge passage and the discharge-pressure region.
- In some configurations, the hub extends at least partially through the opening in the partition plate and includes a diametrical surface cooperating with a diametrical surface of the opening to define an annular chamber therebetween. The annular chamber may receive fluid from the first and second bypass passages when the bypass valve member is in the second position.
- In some configurations, the bypass valve retainer is disposed within the annular chamber.
- In some configurations, the compressor includes a discharge valve retainer attached to the partition plate and defining a discharge cavity in communication with the discharge-pressure region. A discharge valve member may be disposed within the discharge cavity and may be movable therein between a first position in which the discharge valve member restricts communication between the discharge passage and the discharge cavity and restricts communication between the annular chamber and the discharge cavity and a second position in which the discharge valve member allows communication between the discharge passage and the discharge cavity and allows communication between the annular chamber and the discharge cavity.
- In some configurations, the discharge valve retainer includes a diametrical surface defining the discharge cavity and including a plurality of openings providing communication between the discharge-pressure region and the discharge cavity.
- In some configurations, the first end plate cooperates with the partition plate to define an annular biasing chamber therebetween that extends around the discharge passage and the first and second bypass passages. The first end plate may include a bleed hole extending therethrough and communicating with the biasing chamber.
- In some configurations, the compressor includes first and second seal members sealing contacting the first end plate and the partition plate and defining the biasing chamber.
- In some configurations, the first end plate includes first and second annular grooves. The first and second seal members may each include an L-shaped cross section having a first leg and a second leg. The first legs of the first and second seal members may be received in the first and second annular grooves, respectively. The second legs of the first and second seal members may extend parallel to the partition plate and sealingly contact the first end plate and the partition plate.
- In another form, the present disclosure provides a compressor that may include a shell, first and second scroll members, a partition plate, a valve housing and a bypass valve member. The shell may define a discharge-pressure region and a suction-pressure region. The first scroll member is disposed within the shell and includes a first end plate and a first spiral wrap extending from a first side of the first end plate. The first end plate may include a discharge recess, a discharge passage, a first bypass passage and a second bypass passage. The discharge recess may be in communication with the discharge passage and the discharge-pressure region. The first and second bypass passages may extending through the first side and a second side of the first end plate. The second scroll member includes a second spiral wrap cooperating with the first spiral wrap to define first and second fluid pockets therebetween. The first and second fluid pockets may be in communication with the first and second bypass passages, respectively. The partition plate is disposed within the shell and separates the discharge-pressure region from the suction-pressure region. The valve housing may extend at least partially through the partition plate and may be partially received in the discharge recess. The valve housing may include a first passage extending therethrough and communicating with the discharge-pressure region and the discharge recess. The bypass valve member may be disposed between the first end plate and a flange of the valve housing and may be movable between a first position in which the bypass valve member restricts fluid flow through at least one of the first and second bypass passages and a second position in which the bypass valve member allows fluid flow through the at least one of the first and second bypass passages and into the first passage in the valve housing.
- In some configurations, the valve housing includes a second passage having a first portion with a first diameter and a second portion with a second diameter that is larger than the first diameter to form a first annular ledge.
- In some configurations, the compressor includes a discharge valve disposed within the discharge recess and including a stem portion that is slidably received in the second portion of the second passage of the valve housing. The discharge valve may be movable relative to the valve housing and the first end plate between a first position in which the discharge valve contacts a second annular ledge defining the discharge recess and restricts communication between the discharge passage and the first passage and a second position in which the discharge valve is spaced apart from the second annular ledge and allows communication between the discharge passage and the first passage.
- In some configurations, the first portion of the second passage in the valve housing allows high-pressure fluid in the discharge-pressure region to bias the discharge valve toward the first position.
- In some configurations, the compressor includes a floating seal slidably received in an annular recess formed in the first end plate. The floating seal may cooperate with the first end plate to define a biasing chamber therebetween. The first end plate may include a bleed hole extending therethrough and communicating with the biasing chamber. The floating seal contacts the valve housing and defines an annular chamber in which the bypass valve member is disposed.
- In some configurations, the first and second bypass passages are disposed between the discharge recess and the annular recess.
- In some configurations, the compressor includes a retaining ring engaging the valve housing and disposed within the discharge recess. The retaining ring may extend radially between the valve housing and a diametrical surface of the discharge recess.
- In some configurations, the bypass valve member is an annular member that slidably engages the valve housing.
- In some configurations, the compressor includes a spring member disposed between the valve housing and the bypass valve member and biasing the bypass valve member toward the first position.
- In some configurations, the spring member is integral with the bypass valve member.
- In another form, the present disclosure provides a compressor that may include a shell, first and second scroll members, a partition plate and first and second bypass valve members. The shell may define a discharge-pressure region and a suction-pressure region. The first scroll member is disposed within the shell and includes a first end plate and a first spiral wrap extending from a first side of the first end plate. The first end plate may include a discharge passage, a first bypass passage and a second bypass passage extending through the first side and a second side of the first end plate. The second scroll member includes a second spiral wrap cooperating with the first spiral wrap to define first and second fluid pockets therebetween. The first and second fluid pockets may be in communication with the first and second bypass passages, respectively. The partition plate is disposed within the shell and separates the discharge-pressure region from the suction-pressure region. The partition plate may include first and second openings in communication with the first and second bypass passages. The first and second bypass valve members may be movable between first positions restricting fluid flow through the first and second openings and second positions allowing fluid flow through the first and second openings.
- In some configurations, the compressor includes a first annular seal fluidly coupling the first bypass passage and the first opening and a second annular seal fluidly coupling the second bypass passage and the second opening.
- In some configurations, the partition plate and the first end plate cooperate to define a biasing chamber therebetween, and wherein the first and second annular seals extend axially through the biasing chamber.
- In some configurations, the first and second bypass valve members are disposed within the discharge-pressure region and mounted to the partition plate.
- In some configurations, the first and second bypass valve members are reed valves that flex between the open and closed positions.
- In some configurations, the compressor includes first and second rigid valve retainers that clamp the first and second bypass valve members against the partition plate and define a range of flexing movement of the first and second bypass valve members.
- In some configurations, the compressor includes third and fourth annular seals that contact the partition plate and the end plate and cooperate to define the biasing chamber therebetween.
- In some configurations, the first end plate includes first and second annular grooves. The third and fourth annular seals may each include an L-shaped cross section having a first leg and a second leg. The first legs of the third and fourth annular seals may be received in the first and second annular grooves, respectively. The second legs of the third and fourth annular seals may extend parallel to the partition plate and sealingly contacting the first end plate and the partition plate.
- In some configurations, the first end plate includes a hub that extends axially through a third opening in the partition plate between the first and second openings.
- In some configurations, the discharge passage extends through the hub.
- In some configurations, the compressor includes a discharge valve disposed within the discharge-pressure region and movable between a first position restricting communication between the discharge passage and the discharge-pressure region and a second position allowing communication between the discharge passage and the discharge-pressure region.
- In some configurations, the discharge valve contacts the hub in the first position.
- In some configurations, the compressor includes a discharge valve retainer attached to the partition plate and defining a discharge cavity in communication with the discharge-pressure region. The discharge valve may be disposed within the discharge cavity and may be movable therein between the first and second positions. The discharge valve retainer may include a diametrical surface defining the discharge cavity and including a plurality of openings providing communication between the discharge-pressure region and the discharge cavity.
- Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.
- The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.
-
FIG. 1 is a cross-sectional view of a compressor having a variable volume ratio valve system according to the principles of the present disclosure; -
FIG. 2 is a partial cross-sectional view of the compressor ofFIG. 1 with a bypass valve in a closed position; -
FIG. 3 is a partial cross-sectional view of the compressor ofFIG. 1 with a bypass valve in an open position; -
FIG. 4 is a partial cross-sectional view of another compressor of with a bypass valve in a closed position; -
FIG. 5 is a partial cross-sectional view of the compressor ofFIG. 4 with a bypass valve in an open position; -
FIG. 6 is a partial cross-sectional view of another compressor of with a bypass valve in a closed position; -
FIG. 7 is a partial cross-sectional view of the compressor ofFIG. 6 with a bypass valve in an open position; -
FIG. 8 is a partial cross-sectional view of another compressor of with a bypass valve in an open position; -
FIG. 9 is a partial cross-sectional view of the compressor ofFIG. 8 with a bypass valve in a closed position; -
FIG. 10 is a perspective view of a valve and spring assembly according to the principles of the present disclosure; -
FIG. 11 is a perspective view of another valve and spring assembly according to the principles of the present disclosure; and -
FIG. 12 is a perspective view of yet another valve and spring assembly according to the principles of the present disclosure. - Corresponding reference numerals indicate corresponding parts throughout the several views of the drawings.
- Example embodiments will now be described more fully with reference to the accompanying drawings.
- Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail.
- The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “comprising,” “including,” and “having,” are inclusive and therefore specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order discussed or illustrated, unless specifically identified as an order of performance. It is also to be understood that additional or alternative steps may be employed.
- When an element or layer is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to,” “directly connected to,” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
- Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
- Spatially relative terms, such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
- With reference to
FIGS. 1-3 , acompressor 10 is provided that may include ashell assembly 12, a discharge fitting 14, a suction inlet fitting 16, amotor assembly 18, a bearinghousing assembly 20, acompression mechanism 22, and a variablevolume ratio assembly 24. - The
shell assembly 12 may house themotor assembly 18, the bearinghousing assembly 20, thecompression mechanism 22, and the variablevolume ratio assembly 24. Theshell assembly 12 may include a generallycylindrical shell 34, anend cap 36, a transversely extendingpartition plate 37, and abase 38. Theend cap 36 may be fixed to an upper end of theshell 34. The base 38 may be fixed to a lower end ofshell 34. Theend cap 36 andpartition plate 37 may define a discharge chamber 42 (i.e., a discharge-pressure region) therebetween that receives compressed working fluid from thecompression mechanism 22. Thepartition plate 37 may include anopening 39 providing communication between thecompression mechanism 22 and thedischarge chamber 42. Thedischarge chamber 42 may generally form a discharge muffler for thecompressor 10. The discharge fitting 14 may be attached to theend cap 36 and is in fluid communication with thedischarge chamber 42. The suction inlet fitting 16 may be attached to theshell 34 and may be in fluid communication with a suction chamber 43 (i.e., a suction-pressure region). Thepartition plate 37 separates thedischarge chamber 42 from thesuction chamber 43. - The
motor assembly 18 may include amotor stator 44, arotor 46, and adriveshaft 48. Thestator 44 may be press fit into theshell 34. Thedriveshaft 48 may be rotatably driven by therotor 46 and supported by the bearinghousing assembly 20. Thedriveshaft 48 may include aneccentric crank pin 52 having a flat thereon for driving engagement with thecompression mechanism 22. Therotor 46 may be press fit on thedriveshaft 48. The bearinghousing assembly 20 may include amain bearing housing 54 and alower bearing housing 56 fixed within theshell 34. Themain bearing housing 54 may include an annular flatthrust bearing surface 58 that supports thecompression mechanism 22 thereon. - The
compression mechanism 22 may be driven by themotor assembly 18 and may generally include anorbiting scroll 60 and anon-orbiting scroll 62. The orbitingscroll 60 may include anend plate 64 having a spiral vane or wrap 66 on the upper surface thereof and an annularflat thrust surface 68 on the lower surface. Thethrust surface 68 may interface with an annular flatthrust bearing surface 58 on themain bearing housing 54. Acylindrical hub 70 may project downwardly from thethrust surface 68 and may have adrive bushing 72 disposed therein. Thedrive bushing 72 may include an inner bore in which thecrank pin 52 is drivingly disposed. Thecrank pin 52 may drivingly engage a flat surface in a portion of the inner bore of thedrive bushing 72 to provide a radially compliant driving arrangement. - The
non-orbiting scroll 62 may include anend plate 78 and aspiral wrap 80 extending from afirst side 82 of theend plate 78. The spiral wraps 66, 80 cooperate to form a plurality offluid pockets 83 therebetween. Asecond side 84 of theend plate 78 may include ahub 86 and inner and outerannular grooves 88, 90 (FIGS. 2 and 3 ). Thehub 86 can be generally axially aligned with the rotational axis of thedriveshaft 48. Theannular grooves hub 86 and may surround thehub 86. - Inner and outer
annular seals annular grooves partition plate 37 and theend plate 78 to form anannular biasing chamber 97 therebetween. Theannular seals second legs 93, 94 (FIGS. 2 and 3 ). Thefirst legs 93 may be received in the correspondingannular grooves second legs 94 may extend generally parallel to thepartition plate 37 and theend plate 78 and sealingly contact thepartition plate 37 and theend plate 78. - As shown in
FIGS. 2 and 3 , thenon-orbiting scroll 62 may also include adischarge passage 95, first andsecond bypass passages bleed hole 100 that extend through theend plate 78. Thedischarge passage 95 may extend axially through thehub 86 and may be in fluid communication with a centralfluid pocket 83 defined by the spiral wraps 66, 80. The first andsecond bypass passages discharge passage 95 and are in fluid communication with respective ones of the fluid pockets 83. The first andsecond bypass passages hub 86 and may be disposed radially between thedischarge passage 95 and the innerannular groove 88. Thebleed hole 100 may be disposed radially between the inner and outerannular grooves fluid pocket 83. Thebleed hole 100 is in fluid communication with theannular biasing chamber 97 and provides intermediate-pressure working fluid to theannular biasing chamber 97. In this manner, the working fluid in theannular biasing chamber 97 biases thenon-orbiting scroll 62 in an axial direction (i.e., in a direction parallel to the axis of rotation of the driveshaft 48) into engagement with the orbitingscroll 60. - As shown in
FIGS. 2 and 3 , the variablevolume ratio assembly 24 may include abypass valve retainer 102, abypass valve member 104, aspring member 106, adischarge valve retainer 108 and adischarge valve member 110. Thebypass valve retainer 102 may be fixedly attached to thepartition plate 37 and may be an annular member having afirst side 112 with a firstannular ridge 114 extending therefrom and asecond side 116 opposite thefirst side 112 with asecond ridge 118 extending therefrom. The firstannular ridge 114 may extend into theopening 39 of thepartition plate 37 and an outerdiametrical surface 120 of the firstannular ridge 114 may engage an innerdiametrical surface 122 of theopening 39 by a press-fit, for example. The secondannular ridge 118 can be concentric with the firstannular ridge 114 and may define anopening 124 in fluid communication with thedischarge passage 95, theopening 39 and thedischarge chamber 42. - The
bypass valve member 104 can be a generally flat, annular member and may be disposed within theopening 39 of thepartition plate 37 between thehub 86 of thenon-orbiting scroll 62 andbypass valve retainer 102. Thebypass valve member 104 may surround thedischarge passage 95 and may be movable between a closed position (FIG. 2 ) and an open position (FIG. 3 ). In the closed position, thebypass valve member 104 is in contact with thehub 86 and restricts or prevents fluid flow through the first andsecond bypass passages 96, 98 (i.e., restricting or preventing fluid communication between thebypass passages bypass valve member 104 is spaced apart from thehub 86 and allows fluid flow through the first andsecond bypass passages 96, 98 (i.e., allowing fluid communication between thebypass passages spring member 106 may be disposed between and in contact with thebypass valve member 104 and thebypass valve retainer 102 such that thespring member 106 biases thebypass valve member 104 toward the closed position. - In some configurations, the
partition plate 37 may include anannular ledge 125 that extends radially into theopening 39 of thepartition plate 37. Thebypass valve member 104 may be disposed axially between theannular ledge 125 and thebypass valve retainer 102. In this manner, theannular ledge 125 and thebypass valve retainer 102 cooperate to keep thebypass valve member 104 captive within theopening 39. Therefore, thepartition plate 37 and the variablevolume ratio assembly 24 can be assembled as a unit separately from thenon-orbiting scroll 62. - The
discharge valve retainer 108 may be fixedly attached to thebypass valve retainer 102 and may include acentral hub 126 and aflange 128 extending radially outward from thecentral hub 126. Thecentral hub 126 may define acavity 130 in fluid communication with thedischarge chamber 42 via a plurality ofapertures 132 that extend through inner and outer diametrical surfaces of thecentral hub 126. The secondannular ridge 118 of thebypass valve retainer 102 may be received in thecavity 130 and may act as a valve stop for thedischarge valve member 110. In some configurations, atube 134 may extend through anaxial end 136 of thecentral hub 126 and may direct a portion of the fluid in thecavity 130 directly to the discharge fitting 14. - The
discharge valve member 110 may be a generally flat disk and may be movably received in thecavity 130 of thedischarge valve retainer 108. Thedischarge valve member 110 may be movable relative to thedischarge valve retainer 108 and thebypass valve retainer 102 between a closed position in which thedischarge valve member 110 is seated against the secondannular ridge 118 and an open position in which thedischarge valve member 110 is spaced apart from the secondannular ridge 118. In the closed position, thedischarge valve member 110 restricts or prevents fluid communication between thedischarge chamber 42 and theopening 124 of the bypass valve retainer 102 (thereby restricting or preventing fluid communication between thedischarge passage 95 and the discharge chamber 42). In the open position, thedischarge valve member 110 allows fluid communication between thedischarge chamber 42 and theopening 124 of the bypass valve retainer 102 (thereby allowing fluid communication between thedischarge passage 95 and the discharge chamber 42). - During operation of the
compressor 10, working fluid in thepockets 83 between thewraps non-orbiting scrolls pockets 83 move from a radially outer position (e.g., at suction pressure) toward a radially inner position (e.g., at discharge pressure). Thebypass valve member 104 andspring member 106 may be configured so that thebypass valve member 104 will move into the open position when exposed topockets 83 having working fluid at or above a predetermined pressure. The predetermined pressure can be selected to prevent thecompressor 10 from over-compressing working fluid when thecompressor 10 is operating under lighter load conditions, for example, such as during operation in a cooling mode of a reversible heat-pump system. A system pressure ratio of a heat-pump system in the cooling mode may be lower than the system pressure ratio of the heat-pump system in a heating mode. - If, for example, the
compressor 10 is operating under lighter load conditions and working fluid is being compressed to a pressure equal to or greater than the predetermined pressure by the time thepockets 83 containing the working fluid reaches the first and/orsecond bypass passages bypass valve member 104 will move into the open position to allow the working fluid to flow through thebypass passages openings discharge chamber 42 and/or the tube 134 (after forcing thedischarge valve member 110 toward the open position). In this manner, the first andsecond bypass passages bypass valve member 104 is in the open position. - If working fluid is not compressed to a level at least equal to the predetermined pressure by the time the
pocket 83 containing the working fluid reaches thebypass passages bypass valve member 104 will stay closed, and the working fluid will continue to be compressed until thepocket 83 is exposed to thedischarge passage 95. Thereafter, the working fluid will force thedischarge valve member 110 into the open position and the working fluid will flow into thecavity 130 and into thedischarge chamber 42 and/or thetube 134. - It will be appreciated that the
non-orbiting scroll 62 could include one or more other bypass passages in addition to the first andsecond bypass passages non-orbiting scroll 62 could include only one of thebypass passages - With reference to
FIGS. 4 and 5 , anothercompressor 210 is provided that may have similar or identical structure and functions as thecompressor 10 described above, apart from exceptions described below. Like thecompressor 10, thecompressor 210 may include apartition plate 237, anorbiting scroll 260, anon-orbiting scroll 262 and a variablevolume ratio assembly 224. Thepartition plate 237 may separate adischarge chamber 242 and a suction chamber (like the suction chamber 43). Thepartition plate 237 includes anopening 239 in fluid communication with thedischarge chamber 242. - The
non-orbiting scroll 262 includes anend plate 278 and aspiral wrap 280 extending from afirst side 282 of theend plate 278. Asecond side 284 of theend plate 278 may include ahub 286 and inner and outerannular grooves hub 286 may extend axially through theopening 239 in thepartition plate 237. Thehub 286 may include an outerdiametrical surface 287 that cooperates with adiametrical surface 289 of theopening 239 to define anannular chamber 285 therebetween. Theannular grooves hub 286 and may surround thehub 286. Inner and outerannular seals 291, 292 (similar or identical to theseals 91, 92) may be partially received in theannular grooves partition plate 237 and theend plate 278 to form anannular biasing chamber 297 therebetween, as described above. - The
non-orbiting scroll 262 may also include adischarge passage 295, first andsecond bypass passages bleed hole 300 that extend through theend plate 278. Thedischarge passage 295 may extend axially through thehub 286 and may be in fluid communication with a centralfluid pocket 283 defined by spiral wraps 266, 280 of the orbiting andnon-orbiting scrolls second bypass passages discharge passage 295 and thehub 286 and are in fluid communication with respective ones of the fluid pockets 283. The first andsecond bypass passages hub 286 and the innerannular groove 288. Thebleed hole 300 may be disposed radially between the inner and outerannular grooves fluid pocket 283. Thebleed hole 300 is in fluid communication with theannular biasing chamber 297 and provides intermediate-pressure working fluid to theannular biasing chamber 297. In this manner, the working fluid in theannular biasing chamber 297 biases thenon-orbiting scroll 262 in an axial direction into engagement with theorbiting scroll 260. - The variable
volume ratio assembly 224 may include abypass valve retainer 302, a retainingring 303, abypass valve member 304, aspring member 306, adischarge valve retainer 308 and adischarge valve member 310. Thebypass valve retainer 302 can be an annular member that receives the hub 286 (i.e., thebypass valve retainer 302 extends around the hub 286). In some configurations, thebypass valve retainer 302 may be press-fit onto the outerdiametrical surface 287. In some configurations, thebypass valve retainer 302 may include a generally L-shaped cross section. In some configurations, the retainingring 303 may be partially received in anannular groove 311 formed in the outerdiametrical surface 287 of thehub 286. In some configurations, thespring member 306 may bias thebypass valve retainer 302 into contact with the retainingring 303. - The
bypass valve member 304 can be a generally flat, annular member and may extend around thehub 286 and may be disposed axially between a portion of theend plate 278 and thebypass valve retainer 302. Thebypass valve member 304 may surround thedischarge passage 95 and may be movable between a closed position (FIG. 4 ) and an open position (FIG. 5 ). In the closed position, thebypass valve member 304 is in contact with theend plate 278 and restricts or prevents fluid flow through the first andsecond bypass passages 296, 298 (i.e., restricting or preventing fluid communication between thebypass passages bypass valve member 304 is spaced apart from theend plate 278 and allows fluid flow through the first andsecond bypass passages 296, 298 (i.e., allowing fluid communication between thebypass passages spring member 306 may be disposed between and in contact with thebypass valve member 304 and thebypass valve retainer 302 such that thespring member 306 biases thebypass valve member 304 toward the closed position. - The
discharge valve retainer 308 and thedischarge valve member 310 can have similar or identical structure and function as thedischarge valve retainer 108 and thedischarge valve member 110. Thedischarge valve retainer 308 can be mounted directly to thepartition plate 237. As described above with respect to thedischarge valve retainer 108, thedischarge valve retainer 308 may include acentral hub 326 defining acavity 330. Thehub 286 of thenon-orbiting scroll 262 may extend into thecavity 330 and an axial end of thehub 286 may define avalve seat 331 for thedischarge valve member 310. That is, thedischarge valve member 310 contacts thevalve seat 331 when thedischarge valve member 310 is in the closed position to restrict or prevent fluid communication between thedischarge passage 295 and thedischarge chamber 242. In the closed position, thedischarge valve member 310 may also restrict or prevent fluid communication between theannular chamber 285 and thedischarge chamber 242. - Operation of the variable
volume ratio assembly 224 may be similar or identical to that of the variablevolume ratio assembly 24 described above. That is, thebypass valve member 304 may open to prevent an over-compression condition. When working fluid is being compressed by thescrolls pockets 283 containing the working fluid reaches the first and/orsecond bypass passages bypass valve member 304 will move into the open position to discharge the working fluid to thedischarge chamber 242, as described above. - It will be appreciated that the
non-orbiting scroll 262 could include one or more other bypass passages in addition to the first andsecond bypass passages non-orbiting scroll 262 could include only one of thebypass passages - With reference to
FIGS. 6 and 7 , anothercompressor 410 is provided that may have similar or identical structure and functions as thecompressors compressors compressor 410 may include apartition plate 437, anorbiting scroll 460, anon-orbiting scroll 462 and a variablevolume ratio assembly 424. Thepartition plate 437 may separate adischarge chamber 442 and asuction chamber 443. Thepartition plate 437 includes anopening 439 through which fluid is provided to thedischarge chamber 442. - The
non-orbiting scroll 462 may include anend plate 478 and aspiral wrap 480 extending therefrom. Theend plate 478 may include ahub 486 and anannular recess 488. Theannular recess 488 may at least partially receive a floatingseal assembly 490 therein. Therecess 488 and theseal assembly 490 may cooperate to define anaxial biasing chamber 492 therebetween. - The
non-orbiting scroll 462 may also include adischarge recess 493, adischarge passage 495, first andsecond bypass passages bleed hole 500 that extend through theend plate 478. Thedischarge recess 493 may extend axially through thehub 486 and may be in fluid communication with a central fluid pocket 483 (defined by thescrolls 460, 462) via thedischarge passage 495. The first andsecond bypass passages discharge passage 495 and are in fluid communication with respective ones of the fluid pockets 483. The first andsecond bypass passages hub 486 and may be disposed radially between thedischarge passage 495 and theannular recess 488. Thebleed hole 500 may be in communication with an intermediate-pressure (higher than suction pressure and less than discharge pressure)fluid pocket 483 and theannular biasing chamber 492 and provides intermediate-pressure working fluid to theannular biasing chamber 492. In this manner, the working fluid in theannular biasing chamber 492 biases thenon-orbiting scroll 462 in an axial direction into engagement with theorbiting scroll 460. - The variable
volume ratio assembly 424 may include avalve housing 502, a retainingring 503, abypass valve member 504, aspring member 506, and adischarge valve member 510. Thevalve housing 502 may act as a valve guide and valve stop for thebypass valve member 504 and thedischarge valve member 510. Thevalve housing 502 may be partially received in theopening 439 in thepartition plate 437 and may extend into thedischarge recess 493. In some embodiments, thevalve housing 502 can be press-fit into theopening 439. A radially outwardly extendingflange 511 of thevalve housing 502 can be disposed within thesuction chamber 443 and may contact the floatingseal assembly 490. - The
valve housing 502 may include afirst passage 512 extending therethrough and in fluid communication with thedischarge recess 493 and thedischarge chamber 442. Thevalve housing 502 may include asecond passage 514 in fluid communication with thedischarge chamber 442 and disposed radially inward relative to thefirst passage 512. Thesecond passage 514 may include afirst portion 515 and asecond portion 517. Thesecond portion 517 may include a larger diameter than a diameter of thefirst portion 515 such that thesecond portion 517 defines anannular ledge 519. The retainingring 503 may be disposed within thedischarge recess 493 and may engage thevalve housing 502. The retainingring 503 may retain thebypass valve member 54 and thespring member 506 relative to thevalve housing 502, particularly during assembly of thecompressor 410. - The
bypass valve member 504 may be a generally flat, annular member surrounding a portion of thevalve housing 502 between theflange 511 and an axial end of thehub 486. Thebypass valve member 504 may be movable between a closed position (FIG. 6 ) and an open position (FIG. 7 ). In the closed position, thebypass valve member 504 is in contact with theend plate hub 486 and restricts or prevents fluid flow through the first andsecond bypass passages 496, 498 (i.e., restricting or preventing fluid communication between thebypass passages bypass valve member 504 is spaced apart from thehub 486 and allows fluid flow through the first andsecond bypass passages 496, 498 (i.e., allowing fluid communication between thebypass passages discharge chamber 442 via thefirst passage 512 of the valve housing 502). Thespring member 506 may be disposed between and in contact with thebypass valve member 504 and theflange 511 of thevalve housing 502 such that thespring member 506 biases thebypass valve member 504 toward the closed position. - The
discharge valve member 510 may be disposed within thedischarge recess 493 and may include astem portion 518 and aflange portion 520. Thestem portion 518 may be slidably received in thesecond portion 517 of thesecond passage 514 of thevalve housing 502. Thedischarge valve member 510 is movable between a closed position (FIG. 6 ) and an open position (FIG. 7 ). When thedischarge valve member 510 is in the closed position, theflange portion 520 of thedischarge valve member 510 is in contact with anannular ledge 522 defining a lower axial end of thedischarge recess 493 to restrict or prevent fluid communication between thedischarge recess 493 and the discharge passage 495 (thereby restricting or preventing fluid communication between thedischarge passage 495 and thefirst passage 512 in the valve housing 502). When thedischarge valve member 510 is in the open position, theflange portion 520 is spaced apart from theannular ledge 522 so that thedischarge passage 495 is allowed to fluidly communicate with thedischarge recess 493 and thefirst passage 512 of thevalve housing 502. Theannular ledge 519 in thefirst passage 512 of thevalve housing 502 may contact thestem portion 518 of thedischarge valve member 510 in the fully open position (as shown inFIG. 7 ). Thefirst portion 515 of thesecond passage 514 of thevalve housing 502 allows high-pressure fluid in thedischarge chamber 442 to bias thedischarge valve member 510 toward the closed position. - Operation of the variable
volume ratio assembly 424 may be similar or identical to that of the variablevolume ratio assembly bypass valve member 504 may open to prevent an over-compression condition. When working fluid is being compressed by thescrolls pockets 483 containing the working fluid reaches the first and/orsecond bypass passages bypass valve member 504 will move into the open position to discharge the working fluid to thedischarge chamber 442, as described above. - It will be appreciated that the
non-orbiting scroll 462 could include one or more other bypass passages in addition to the first andsecond bypass passages non-orbiting scroll 462 could include only one of thebypass passages - With reference to
FIGS. 8 and 9 , anothercompressor 610 is provided that may have similar or identical structure and functions as thecompressors compressors compressor 610 may include apartition plate 637, anorbiting scroll 660, anon-orbiting scroll 662 and a variablevolume ratio assembly 624. Thepartition plate 637 may separate adischarge chamber 642 and asuction chamber 643. Thepartition plate 637 includes acentral opening 639 through which fluid is provided to thedischarge chamber 642. Thepartition plate 637 may also include first andsecond bypass openings partition plate 637 and fluidly communicate with thedischarge chamber 642. - The
non-orbiting scroll 662 includes anend plate 678 having ahub 686 and inner and outerannular grooves hub 686 may extend axially through theopening 639 in thepartition plate 637. Theannular grooves hub 686 and may surround thehub 686. Inner and outerannular seals 691, 692 (similar or identical to theseals annular grooves partition plate 637 and theend plate 678 to form anannular biasing chamber 697 therebetween, as described above. - The
non-orbiting scroll 662 may also include adischarge passage 695, first andsecond bypass passages bleed hole end plate 678. Thedischarge passage 695 may extend axially through thehub 686 and may be in fluid communication with a centralfluid pocket 683 defined by thescrolls annular grooves fluid pocket 683 and theannular biasing chamber 697 to provide intermediate-pressure working fluid to theannular biasing chamber 697. The bleed hole may be disposed radially outward relative to the first andsecond bypass passages - The first and
second bypass passages discharge passage 695 and thehub 686 and are in fluid communication with respective ones of the fluid pockets 683. The first andsecond bypass passages annular groove 688 and the outerannular groove 690, but are fluidly isolated from theannular biasing chamber 697. The first andsecond bypass passages second bypass openings partition plate 637. A firstannular seal 649 is partially received in arecess 651 of thefirst bypass passage 696 and sealingly engages theend plate 678 and thepartition plate 637 to fluidly isolate thefirst bypass passage 696 and the first bypass opening 645 from theannular biasing chamber 697. A secondannular seal 653 is partially received in arecess 655 of thesecond bypass passage 698 and sealingly engages theend plate 678 and thepartition plate 637 to fluidly isolate thesecond bypass passage 698 and the second bypass opening 647 from theannular biasing chamber 697. - The variable
volume ratio assembly 624 may include first and secondbypass valve retainers bypass valve members discharge valve retainer 708 and adischarge valve member 710. Thebypass valve retainers bypass valve members partition plate 637 within thedischarge chamber 642 such that thebypass valve members bypass valve retainers partition plate 637. - The
bypass valve members FIG. 8 ) in which thebypass valve members second bypass passages discharge chamber 642 and closed positions (FIG. 9 ) in which thebypass valve members second bypass passages discharge chamber 642. Thebypass valve retainers bypass valve members - The
discharge valve retainer 708 and thedischarge valve member 710 can have similar or identical structure and function as thedischarge valve retainer discharge valve member discharge valve retainer 708 can be mounted directly to thepartition plate 637. As described above with respect to thedischarge valve retainer 108, thedischarge valve retainer 708 may include acentral hub 726 defining acavity 730. Thehub 686 of thenon-orbiting scroll 662 may extend into thecavity 730 and an axial end of thehub 686 may define avalve seat 731 for thedischarge valve member 710. That is, thedischarge valve member 710 contacts thevalve seat 731 when thedischarge valve member 710 is in the closed position to restrict or prevent fluid communication between thedischarge passage 695 and thedischarge chamber 642. - Operation of the variable
volume ratio assembly 624 may be similar or identical to that of the variablevolume ratio assembly bypass valve members scrolls pockets 683 containing the working fluid reaches the first and/orsecond bypass passages bypass valve members discharge chamber 642, as described above. - It will be appreciated that the
non-orbiting scroll 662 could include one or more other bypass passages in addition to the first andsecond bypass passages non-orbiting scroll 662 could include only one of thebypass passages - With reference to
FIGS. 10-12 , various alternative configurations of thebypass valve member spring member bypass valve member spring member bypass valve member spring member bypass valve member FIG. 10 , thespring member FIG. 11 , thespring member FIG. 12 , thespring member spring member - The foregoing description of the embodiments has been provided for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure. Individual elements or features of a particular embodiment are generally not limited to that particular embodiment, but, where applicable, are interchangeable and can be used in a selected embodiment, even if not specifically shown or described. The same may also be varied in many ways. Such variations are not to be regarded as a departure from the disclosure, and all such modifications are intended to be included within the scope of the disclosure.
Claims (20)
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US15/784,540 US10323639B2 (en) | 2015-03-19 | 2017-10-16 | Variable volume ratio compressor |
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US14/663,073 US9790940B2 (en) | 2015-03-19 | 2015-03-19 | Variable volume ratio compressor |
US15/784,540 US10323639B2 (en) | 2015-03-19 | 2017-10-16 | Variable volume ratio compressor |
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US15/784,458 Active US10323638B2 (en) | 2015-03-19 | 2017-10-16 | Variable volume ratio compressor |
US15/784,540 Active US10323639B2 (en) | 2015-03-19 | 2017-10-16 | Variable volume ratio compressor |
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US15/784,458 Active US10323638B2 (en) | 2015-03-19 | 2017-10-16 | Variable volume ratio compressor |
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Also Published As
Publication number | Publication date |
---|---|
CN205533207U (en) | 2016-08-31 |
US9790940B2 (en) | 2017-10-17 |
US20180038369A1 (en) | 2018-02-08 |
CN105986998A (en) | 2016-10-05 |
US10323639B2 (en) | 2019-06-18 |
US10323638B2 (en) | 2019-06-18 |
US20160273538A1 (en) | 2016-09-22 |
CN105986998B (en) | 2019-03-29 |
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